JPS61125818A - Manufacture of composite composed of rubber and polyethylene - Google Patents

Abstract

PURPOSE:To obtain the composite composed of rubber and polyethylene, combining said both materials with the vulcanization of the rubber by pressurizing and heating the unvulcanized compounding rubber and polyethylene having been mutually laminated. CONSTITUTION:After the unvulcanized compounding rubber containing 30-80wt% polyethylene or ethylene, and polyethylene have been mutually laminated, the compounding rubber is combined with the polyethylene, while vulcanizing the unvulcatized compounding rubber by heating and pressurizing, whereby the composite composed of rubber and polyethylene is produced. This composite is used for a lining sheet stuck to the inner wall surface of a rubber hose, a rubber sheet and the hopper for powder material, and a rubber shoes, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a composite of rubber and polyethylene, and more specifically, for manufacturing a composite of rubber and polyethylene. This invention relates to a method for manufacturing a composite of rubber and polyethylene used as a lining sheet to be adhered.

[Conventional technology]

Polyethylene is non-polar and crystalline, so it is extremely difficult to bond (bond) it with other materials. In other words, since it is crystalline, there is no solvent that dissolves at room temperature, so it cannot be bonded with a solvent.
Since adhesion with S liquid is also difficult, various configurations have been proposed for methods of manufacturing composites of polyethylene and rubber. For example, (1) A method of obtaining a composite by adhering by heat sealing at a temperature of 225 to 350 F. In the case of this method, it is generally possible to obtain a #N9Ii composite of about 0.3 to 2.0 kg/c.

■ A method of bonding without surface treatment using polyisobutylene or butyl rubber solvent or latex as an adhesive to obtain a composite, and a method of vulcanization bonding using butyl rubber at a temperature higher than the melting point of polyethylene. It is possible to obtain a composite that develops a reasonably high adhesive strength.

■ A method of surface-treating polyethylene by mechanical polishing, cleaning with a solvent, oxidation with a gas flame or heated air, electrical treatment such as corona discharge, primer treatment, etc., and then settling with an adhesive to obtain a composite; This method makes it possible to obtain composites with extremely high adhesive strength.

[Problem that the invention seeks to solve]

However, in the case of the previously proposed methods for producing composites of polyethylene and rubber as described above, those that simply undergo heat treatment or those that adhere with adhesive do not have stable adhesion (bondability). The problem is that it is difficult to obtain.

In addition, after treating the surface of polyethylene with various means,
Products that are bonded have problems such as a complicated treatment process when attempting to obtain a uniform surface treatment to improve adhesion.

In view of the above points, the present invention solves the problems of the conventional method for producing a composite of rubber and polyethylene, and provides an industrially useful method with excellent stability and adhesive properties. The object of the present invention is to provide a method for producing a composite of polyethylene and rubber that can be obtained extremely easily without using any agents.

[Means for solving problems]

In order to achieve this object, the present invention laminates polyethylene or unvulcanized compounded rubber containing 30 to 80% by weight of ethylene and polyethylene, and then pressurizes and heats it to form the unvulcanized compounded rubber. This method consists of a method for producing a composite of rubber and polyethylene, in which the compounded rubber and the polyethylene are bonded together with vulcanization. Here, the unvulcanized compounded rubbers include natural rubber (Ni2), chloroprene rubber (CI), butyl rubber (+1R), and 90-rosulfonated ethylene (C
3M), or ethylene-propylene copolymer rubber (
IP) etc. is used as the main raw material, and in addition, a vulcanizing agent, a vulcanization accelerator, a vulcanization accelerating aid, an activator, a rubber reinforcing agent, etc. are used. However, the present invention is not limited to this formulation, and other formulations may also be used.

Here, polyethylene or ethylene is mixed into the above compounded rubber, but if the compounded rubber is an unvulcanized compounded rubber based on ethylene-propylene copolymer rubber (EPfSIIPD?l), it is already in the compounded rubber. contains ethylene, so they are usually not mixed in.

The reason for setting the proportion of polyethylene or ethylene mixed in the compounded rubber to 30 to 80% by weight is that if it is less than 30%, there will be some problems in terms of peel strength, and if it is more than 80%, the above-mentioned This was done in consideration of the possibility that the rubber would no longer exhibit the characteristics of rubber, would have a structure of polyethylene, and would no longer exhibit the properties of a composite of rubber and polyethylene.

The polyethylene mixed into the compounded rubber is usually mixed in as a fine powder or heated at 120°C on a roll.
The above is used as pellets by melting and mixing. However, it may be mixed in other forms.

In addition, the above-mentioned composite refers to a composite obtained from a rubber hose, a rubber sheet, a lining sheet attached to the inner wall surface of a powder hopper, etc., a rubber shoe, or a joint in which rubber and polyethylene are attached, etc. It is clear that the rubber and polyethylene forming the composite are not limited to sheet forms.

[Effect]

Next, the operation of the present invention will be explained based on the above configuration.

That is, by laminating unvulcanized compounded rubber and polyethylene,
By pressurizing and heating this with a vulcanizer or the like, the compounded rubber and polyethylene are strongly integrated and bonded together.

In this way it is possible to obtain a composite of rubber and polyethylene.

〔Example〕

Next, the present invention will be explained more specifically based on Examples.

Example 1 - Natural rubber as the main raw material, sulfur as the vulcanizing agent, 2-penzothiazolyldylerphdide (DM) as the vulcanization accelerator
Using zinc oxide as a vulcanization accelerator, stearic acid as an activator, and furnace black (carbon HAF) as a rubber reinforcing agent, an unvulcanized compounded rubber containing polyethylene powder and a polyethylene sheet are laminated, Pressure, heating, and vulcanization were performed by press molding to obtain a composite of rubber and polyethylene that was bonded at the same time.

The unvulcanized compounded rubber used was the one shown in Table 1.

Here, the unit of formulation is parts by weight.

Table 1 The adhesive strength of the composite obtained in Example 1 is 5 kg/
At 25 ㎇, the peeling status showed that a part of the rubber layer was broken and no interfacial peeling was observed. In addition, in order to confirm the effect of the composite obtained in this example, the adhesive strength and peeling status of the composites of Comparative Examples 1 and 2 with other formulations were also investigated. The force was 0゜3kJl/25m-, and the peeling state was that the interface aui was observed, and the adhesion force for Comparative Example 2 was 1.5kg/25m-
As for the peeling condition, interfacial separation was observed.

From this, it was confirmed that according to Example 1 of the present invention, it was possible to obtain a method for producing a composite of rubber and polyethylene, which has an excellent effect on adhesive strength and in which rubber and polyethylene are integrated. .

Example 2 - A composite of rubber and polyethylene was obtained with the formulation shown in Table 2.

Table 2° □ The adhesive strength of the composite obtained in Example 2 was 3.5k.
g/25 m-, and the peeling state was that a part of the rubber layer was broken and no interfacial peeling was observed. In addition, in order to confirm the effect of the composite obtained in this example, the adhesive strength and IIIIII status of the composite □ of Comparative Example 3.4 with other formulations were investigated, and it was found that Comparative Example 3 The adhesive force is 0゜3kg/25m-
As for the peeling condition, interfacial peeling was observed, and the adhesion strength of Comparative Example 4 was 0.5 kg/25 m-, and interfacial peeling was observed as the peeling condition.

From this, it was confirmed that Example 2 of the present invention had an excellent effect on adhesive strength.

Example 3 - A composite of rubber and polyethylene was obtained with the formulation shown in Table 3.

The adhesive strength of the composite obtained in Example 3 was 3.5k.
g/25m5, and in the l1ilIllI situation, a part of the rubber layer was broken and no interface 111IIIllI was observed. In addition, in order to confirm the effect of the composite obtained in this example, the adhesive strength and peeling status of the composites of Comparative Examples 5 and 6 with other formulations were investigated. Force is 0.2kg/25
-, the peeling condition was interfacial peeling, and Comparative Example 6
The adhesive force is 1-5kg/25m5, and the peeling status is 1 at the interface! l1llllI was observed.

Table 3 From this, it was confirmed that Example 3 of the present invention had an excellent effect on adhesive strength.

Example 4 - A composite of rubber and polyethylene was obtained with the formulation shown in Table 4.

Table 4 And the adhesive strength of the composite obtained in Example 4 is 5 kg
/25m-, interfacial peeling was observed. In addition, in order to confirm the effect of the composite obtained in this example, the adhesion strength and #1 release status of the composites of Comparative Examples 7 and 8 with other formulations were investigated.
The adhesive force for Comparative Example 7 was 0.1k1725sya, and interfacial peeling was observed in the 1!11 layer situation, and the adhesive force for Comparative Example 8 was 2.5 kg/25-, and the peeling #
In the I condition, interfacial peeling was observed.

From this, it was confirmed that Example 4 of the present invention had an excellent effect on adhesive strength.

Example 5.6.7 - A composite of rubber and polyethylene was obtained with the formulation shown in Table 5.

And the adhesive strength of the composite obtained in this Example 5.6.7,
I investigated the separation situation and found that it was the NH reaction between rubber and polyethylene, and when I tried to separate it further, the polyethylene side broke in Example 5, and in Example 7 The result was that part of the rubber layer broke.

From this, it was found that the rubber and polyethylene obtained in this example were a composite with an integrated structure, and there was no risk of peeling. This example shows the case where a rubber hose was manufactured as a composite using the formulation shown in Example 6 above.

That is, a polyethylene tape of 1@@thickness x 401 width is wrapped around the mantle at 201 pitches, the ends are fixed with adhesive tape or wire, and an unvulcanized compound rubber sheet is wrapped over it, and then Same as the rubber hose molding method, 2p polyester coat topped with rubber,
1 piece of reinforcing wire.

After covering the nylon plain woven sheet 1p and cover rubber 2-thick and taping, vulcanization was performed under vulcanization conditions of 148° C. for 1 hour to obtain a rubber hose.

In this rubber hose, the polyethylene layer on the inner surface was completely fused with the rubber layer forming the upper layer, and the hose had a smooth surface and no holes. In addition, the polyethylene layer and the rubber layer were strongly bonded and did not peel off even when bent to the point of kinking. Therefore, the rubber hose according to this example has excellent corrosion resistance, solvent resistance, and is suitable as a non-contaminating rubber hose. It has the advantage of being usable.

Example 9 - This example shows the case where a rubber sheet was manufactured as a composite using the formulation shown in Example 6 above.

That is, unvulcanized compounded rubber is divided into 1 mm thick x 10,100 mm wide using a rolling mill (calender roll), and this and 1 mm
- FJ A rubber sheet made of a composite of vulcanized rubber and polyethylene was obtained.

Note that a Teflon film, paper sheet, cloth sheet, etc. may be used here instead of the polyester film as the mold release material.

This rubber sheet had a strong fusion of rubber and polyethylene, had excellent bending resistance, and no peeling phenomenon was observed.

Example 10 - This example is an example in which the rubber sheet obtained in Example 9 was used as a lining sheet for the inner surface of an iron water storage tank.

That is, the exposed surface of the rubber side of the rubber sheet obtained in Example 9 was puffed onto the inner surface of the iron water storage tank, and then bonded.
After applying the first agent, it was adhered, and the joint was sealed using a sealing tape with a width of 20 mm to seal the lining.

When the inner surface of this iron water storage tank was inspected after a certain period of time had elapsed, no 1llllllI phenomenon was observed between the rubber and polyethylene, and no impurities were extracted from the surface.

〔Effect of the invention〕

As is clear from the above description, the present invention solves the problems of the conventional bonding method of rubber and polyethylene, is industrially useful, and has excellent stability.
In addition, a method for producing a composite of polyethylene and rubber, which can be obtained extremely easily without using an adhesive, can be practiced.

(force%2%)

Claims (3)

[Claims] (1) 30-80% by weight of polyethylene or ethylene
A rubber characterized in that the unvulcanized compounded rubber contained therein and polyethylene are laminated and then pressurized and heated to vulcanize the compounded rubber and bond the compounded rubber and the polyethylene. and polyethylene. (2) The unvulcanized compounded rubber containing 30 to 80% by weight of ethylene is characterized by using an unvulcanized compounded rubber based on ethylene-propylene copolymer rubber containing 30 to 80% by weight of ethylene. Claim 1
A method for producing a composite of rubber and polyethylene as described in 2. (3) The method for producing a composite of rubber and polyethylene according to claim 1 or 2, wherein the composite is a rubber sheet, a rubber hose, or a lining sheet.